Attachment for phonographs.



F. T; KENT.

ATTACHMENT FOR PHONOGRAPHS.

APPLICATION FILED NOV. 15. 1916.

L293 797 Patsmed Feb, 11, 1919.

gm'umtoz pnirnn sraans manna orrron.

FRANK T. KENT, OF HOME, NEW YORK.

ATTACHMENT FOR PHONOGRAPHS.

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Application filed November 15, 1916. Serial No. 131,521.

- to the standard types of phonographs and which when so applied willimprove the quality of the reproduction by reducing or eliminating themetallic and mechanical sounds.

Other objects and the features of novelty will be apparent from thefollowing description taken in connection with the accompanyingdrawings, in which,

Figure 1 is a plan view of the sound tube and sound box of a well-knowntype of phonograph;

Fig. 2 is an enlarged fragment of Fig. 1 with the sound tube shown insection and provided with my improvement;

Fig. 3 is aview similar to Fig. 2 but showing another form of theinvention;

Fig. 4 is a perspective view of the attachment shown in Fig. 2; I

Fig. 5 is a section showing a slight modification of Fig. 3.

Referring to the drawings, 10 indicates the sound tube which carries atthe end 11 a goose-neck 12, this goose-neck having a 1 I have discoveredthat by placing a plug or diaphragm such as is indicated at 16, in theend 14 of the goose-neck, near the soundbox 13, and providing a centralperforation in this diaphragm, the sounds emanating from the sound-box13 will be greatly mufiied. I have also found that by inserting aminiature megaphone or sound amplifier 17 in the said perforation in thediaphragm 16, the sounds will be restored to substantially the normalvolume but the harsh mechanical sounds will be largely eliminated,thereby giving greater promi- Referring to the nence to the sounds thatare reproduced Specification of Letters Patent. Patented Fat). 11, I

from the record and making the reproduction more natural. As will beobserved from Fig. 2, the amplifier 17 projects'from"the diaphragm orpartition 16 into the gooseneck,in the direction of movementorpropagation of the sound waves.- Care should'b'e exercised, however, tohave the amplifier "17 out of contact with the goose-neck12 and thussupported entirely bythe diaphragm 16, which should be of non-resonantmaterial such as rubber so as to 'con stitute'aj'nonresonant connectionbetween the 7 goose-neck and the amplifier. i It will be observed'thatthe sound box-'13 may be readily removed from or replaced readilyinserted or removed from thejposi t'on shown in Fig. 2.

form' of the invention illustrated in Fig. 3,'it'will be-observed thatthis construction comprises the well-known rubber disk 18 which isattached directly to the end of the goose-neck 12f and'has securedthereon, by means of screws 19, th'e sound-box 20. I arrange between thedisk 18 and the sound-box a diaphragm 21 havingfa small central aperture22 in which'a miniature megaphone or sound amplifier 23' is secured. Theamplifier 23 projects throiigh the disk 18 into the goose-neck 12': andoperates in substantially the same manner as the amplifier 17 shown inFig. *2."

In Fig. 5 the modification consists in mar-i ing the disk 21 integralwith the disk 18" so that the sound amplifier 23 willbe carried by thedisk 18' and the separate diaphragm 21 shown in Fig. 3, eliminated.

It will be noted that the receiving end of the amplifier, in thedifferent forms of the invention, is relatively small and located closeto the sound box and it seems that this location produces much moresatisfactory results than when the amplifier is at a position in thesound tube, more remote from Having described the invention What isclaimed 1s:

'1. In apparatus of the class described, the combination of a soundconduit, a sound box detachabl'y mounted on one end of said conduit, asound amplifier projecting into said end of the conduit and throughwhich the sounds are conveyed from said sound box, and non-resonantmeans through which said amplifier is supported in said conduit.

2. In apparatus of the class described, the combination of a soundconduit, a non-resonant member supported at one end of said conduit andprovided with a central longitudinal perforation, a sound amplifiercarried by said member and projecting into said sound conduit, and asound boxon said end of the conduit and from which the sounds aretransmitted to the sound conduit by said amplifier.

3. In apparatus of the class described, the combination of a soundconduit, a source of sound connected therewith, a non-resonant partitionacross said conduit and having a perforation extendin longitudinally ofthe conduit, and a. sound amplifier secured in said perforation.

4. In apparatus of the class described, the combination of a soundconduit, a source of sound connected therewith, a non-resonant partitionacross said conduit and having a perforation extending longitudinally of:ne conduit, and a sound amplifier secured in said perforation andsupported entirely by said partition.

5. In apparatus of the class described, the combination of a soundconduit, a source of sound connected therewith, a non-resonant partitionacross said conduit and having a perforation extending longitudinally ofthe conduit, and a sound amplifier secured in said perforation andprojecting from said partition in the direction of movement of the soundwaves.

6. In apparatus of the class described, the combination of a soundconduit, a sound box detachably mounted on one end of said conduit, anon-resonant partition fitting the interior of said end of the conduitand provided with a perforation extending longitudinally of the conduit,and a sound amplifier secured in said perforation.

7. In apparatus of the class described, the combination of a soundconduit, a sound amplifier supported in said conduit by meansconstituting a non-resonant connection therebetween, and a sound boxdetachably mounted on said conduit and transmittiiig sound through saidamplifier to the conduit.

8. In apparatus of the class described, the combination of a member madeof non-resonant material and adapted to fit the interior of a soundconduit, said member having a central perforation, and a funnel-shapedsound amplifier projecting from one side of said member and having thesmaller end thereof arranged in said perforation.

9. As a new article of manufacture, a substantially cylindrical membermade of nonresonant material and provided Witha central longitudinalperforation and a funnelshaped member made of resonant material, andhaving its smaller end secured in said perforation.

10. In apparatus of the class described, the combination of a soundconduit, a member made of non-resonant material and detachably arrangedon the end of said c0nduit, a sound box detachably secured to saidmember, a disk arranged between said memher and said sound box, andhaving a central perforation, and a funnel-shaped sound amplifier havingits smaller end secured in said perforation and supported Wholly by saiddisk.

In testimony whereof I aflix my signature.

FRANK 'I. KENT.

flople: of this patent may be obtained for five cents each, byaddressing the Commireioner of Patents.

Washington, D. t3.

